﻿body {
    width:990px;
    margin: 0 auto;
    
}
#conten{
    width:100%;
    background-color:pink;
}
#left{
   float: left; 
     width:  20%; 
     background-color:red; 
     height:450px;
    
}

#center{ 
    float: left; 
    width: 80%; 
   
    background-color:yellow;
    min-height: 450px; 
}

